fix(security): a dismissed status announcement no longer hides the security nudge (#307)

SecurityBanner asked pickBanner whether another strip would show without
the dismissed set, so a dismissed Kuma announcement (often pinned for
weeks) still counted and suppressed the verify / backup nudge on every
device that had dismissed it. The dismissed set is now a shared jotai
atom (still persisted to localStorage) used by both banners. Adds a
Playwright regression.

Fixes #307

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

e2e/security-nudge.spec.ts

@@ -29,6 +29,32 @@ async function settled(page: Page) {
   await page.waitForTimeout(2000);
 }
 
+/** [Gitea #307] Serve a Kuma status page for `localhost` with one posted announcement. */
+async function mockAnnouncement(page: Page) {
+  await page.route(/\/config\.json(\?.*)?$/, async (route) => {
+    const res = await route.fetch();
+    const cfg = await res.json();
+    cfg.statusPages = { localhost: { url: 'https://isitup.lotusguild.org', slug: 'matrix' } };
+    await route.fulfill({ response: res, json: cfg });
+  });
+  await page.route(/isitup\.lotusguild\.org\/api\/status-page\//, async (route) => {
+    const cors = { 'access-control-allow-origin': '*' };
+    if (route.request().url().includes('/heartbeat/')) {
+      await route.fulfill({ headers: cors, json: { heartbeatList: {}, uptimeList: {} } });
+      return;
+    }
+    await route.fulfill({
+      headers: cors,
+      json: {
+        config: { slug: 'matrix' },
+        incidents: [{ id: 7, title: 'Community call on Friday', content: '', style: 'info' }],
+        maintenanceList: [],
+        publicGroupList: [],
+      },
+    });
+  });
+}
+
 test.describe('security nudge (#110, #123)', () => {
   let user: TestUser;
 
@@ -60,6 +86,22 @@ test.describe('security nudge (#110, #123)', () => {
     await expect(page.getByText('Device Verification').first()).toBeVisible();
   });
 
+  test('a dismissed announcement no longer hides the nudge (#307)', async ({ page }) => {
+    test.setTimeout(200_000);
+    await mockAnnouncement(page);
+    await loginUI(page, user);
+    await pastGrace(page);
+    await settled(page);
+    // The announcement wins the one strip slot until it's dismissed.
+    const announcement = page.getByRole('status').filter({ hasText: 'Community call on Friday' });
+    await expect(announcement).toBeVisible();
+    await expect(strip(page)).toHaveCount(0);
+    await announcement.getByRole('button', { name: 'Dismiss' }).click();
+    await page.reload();
+    await settled(page);
+    await expect(strip(page)).toContainText("Your encryption keys aren't backed up");
+  });
+
   test('"Not now" snoozes it across a reload', async ({ page }) => {
     test.setTimeout(200_000);
     await loginUI(page, user);